download spybot search & destroy here: http://public.planetmirror.com/pub/s...spybotsd15.exe and download AVG here: http://www.download.com/AVG-Anti-Vir...-10669237.html
What i would recommend you do is download these two programs from another computer, burn it on a cd or put it on a usb flash drive and install it in your computer. Before you turn on your computer, disconnect your network cable so you wont get online. After you install these two programs, run them one at a time and scan your computer, If the programs find something, fix / heal the problem. After that, restart you computer, connect your to the internet, update both programs and scan your computer again. Btw, spy bot search & destroy will ask you to scan after you restart your computer if it cant fix the problem cause the problem is in your memory. I would recommend you using Firefox: http://www.mozilla.com/products/down...win&lang=en-US instead of Internet Explorer to browse.